1-byte memory overwrite in resolver

1-byte memory overwrite in resolver Severity: medium CVE-2021-23017 Not vulnerable: 1.21.0+, 1.20.1+ Vulnerable: 0.6.18-1.20.0...

The vulnerability of the ngx_resolver_copy() function in the nginx server allows a hacker to execute arbitrary code or cause a service failure.

The vulnerability of the ngxresolvercopy function in the nginx server is related to a single-byte offset error during the writing of the point symbol '.', 0x2E beyond the buffer limit. Exploiting this vulnerability allows an attacker to execute arbitrary code or cause a service failure by sending...

SUSE-SU-2021:1815-1 Security update for nginx

This update for nginx fixes the following issues: - CVE-2021-23017: nginx DNS resolver off-by-one heap write bsc1186126...

Remote Code Execution (RCE)

Overview Affected versions of this package are vulnerable to Remote Code Execution RCE. This can occur when used with untrusted input, due to unsafe PAC file handling. In order to exploit this vulnerability in practice, this either requires an attacker on your local network, a specific vulnerable...

SUSE-SU-2021:1792-1 Security update for nginx

This update for nginx fixes the following issues: - CVE-2021-23017: nginx DNS resolver off-by-one heap write bsc1186126...

USN-4967-2: nginx vulnerability

USN-4967-1 fixed a vulnerability in nginx. This update provides the corresponding update for Ubuntu 14.04 ESM and 16.04 ESM. Original advisory details: Luis Merino, Markus Vervier, and Eric Sesterhenn discovered that nginx incorrectly handled responses to the DNS resolver. A remote attacker could...

Internet Bug Bounty: 1-byte heap buffer overflow in DNS resolver

Official announcement: http://mailman.nginx.org/pipermail/nginx-announce/2021/000300.html A security issue in nginx resolver was identified, which might allow an attacker to cause 1-byte memory overwrite by using a specially crafted DNS response, resulting in worker process crash or, potentially,...

nginx 1.20.0 DNS Resolver Off-By-One Heap Write Exploit

An off-by-one error in ngxresolvercopy while processing DNS responses allows a network attacker to write a dot character '.', 0x2E out of bounds in a heap allocated buffer. The vulnerability can be triggered by a DNS response in reply to a DNS request from nginx when the resolver primitive is...

USN-4967-1 nginx vulnerability

Luis Merino, Markus Vervier, and Eric Sesterhenn discovered that nginx incorrectly handled responses to the DNS resolver. A remote attacker could use this issue to cause nginx to crash, resulting in a denial of service, or possibly execute arbitrary code...

USN-4967-1: nginx vulnerability

Luis Merino, Markus Vervier, and Eric Sesterhenn discovered that nginx incorrectly handled responses to the DNS resolver. A remote attacker could use this issue to cause nginx to crash, resulting in a denial of service, or possibly execute arbitrary code...

Vulnerability fixed in Nginx

A vulnerability has been fixed in Nginx. The vulnerability allows a remote malicious party the ability to cause a denial-of-service cause and potentially execute arbitrary code by sending a specially prepared DNS response. Nginx is only vulnerable if the "resolver directive" is used in the...

nginx 1.20.0 DNS Resolver Off-By-One Heap Write

Advisory X41-2021-002: nginx DNS Resolver Off-by-One Heap Write Vulnerability ============================================================================= Severity Rating: High Confirmed Affected Versions: 0.6.18 - 1.20.0 Confirmed Patched Versions: 1.21.0, 1.20.1 Vendor: F5, Inc. Vendor URL:...

FreeBSD : NGINX -- 1-byte memory overwrite in resolver (0882f019-bd60-11eb-9bdd-8c164567ca3c)

NGINX team reports : 1-byte memory overwrite might occur during DNS server response processing if the 'resolver' directive was used, allowing an attacker who is able to forge UDP packets from the DNS server to cause worker process crash or, potentially, arbitrary code execution. %NASLMINLEVEL 703...

PT-2021-3126

Name of the Vulnerable Software and Affected Versions nginx versions 1.20.0 Description A security issue in the nginx resolver was identified, which might allow an attacker who is able to forge UDP packets from the DNS server to cause a 1-byte memory overwrite, resulting in a worker process crash...

NGINX -- 1-byte memory overwrite in resolver

NGINX team reports: 1-byte memory overwrite might occur during DNS server response processing if the "resolver" directive was used, allowing an attacker who is able to forge UDP packets from the DNS server to cause worker process crash or, potentially, arbitrary code execution...

CVE-2021-23017

A security issue in nginx resolver was identified, which might allow an attacker who is able to forge UDP packets from the DNS server to cause 1-byte memory overwrite, resulting in worker process crash or potential other impact...

RHEL 8 : bind (RHSA-2021:1989)

"The remote Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2021:1989 advisory. The Berkeley Internet Name Domain BIND is an implementation of the Domain Name System DNS protocols. BIND includes a DNS server named %NASLMINLEVEL...

RHEL 8 : unbound (RHSA-2021:1853)

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:1853 advisory. The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver. Security Fixes: unbound: integer overflow in the...

Important: Red Hat Security Advisory: bind security update

An update for bind is now available for Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerability from the...

Moderate: Red Hat Security Advisory: unbound security, bug fix, and enhancement update

An update for unbound is now available for Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerability from th...